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RESTRUCTURINGS (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 9 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Employee Severance And Other Benefits | Dec. 31, 2013 Asset Write Downs | Dec. 31, 2013 Facility Related Charges | Apr. 25, 2013 April 2013 Restructuring position | Dec. 31, 2013 April 2013 Restructuring | Dec. 31, 2013 April 2013 Restructuring One-time termination benefits | Dec. 31, 2013 April 2013 Restructuring One-time termination benefits and facility-related charges | Dec. 31, 2013 April 2013 Restructuring Asset Write Downs | Dec. 31, 2013 April 2013 Restructuring Facility Related Charges | Dec. 03, 2012 December 2012 Restructuring position | Jun. 30, 2013 December 2012 Restructuring item | Dec. 31, 2013 December 2012 Restructuring | Dec. 31, 2012 December 2012 Restructuring | Dec. 03, 2012 December 2012 Restructuring One-time termination benefits | Dec. 03, 2012 December 2012 Restructuring Asset Write Downs | Jun. 30, 2012 November 2011 Restructuring item | Dec. 31, 2012 November 2011 Restructuring | Dec. 31, 2011 November 2011 Restructuring | Nov. 14, 2011 November 2011 Restructuring position | Dec. 31, 2011 November 2011 Restructuring One-time termination benefits | Dec. 31, 2011 November 2011 Restructuring Asset Write Downs
RESTRUCTURINGS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of positions eliminated, inception to date |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  | 43 |  |  |  |  |  |  |  |  | 66 |  |
Proceeds from sales of property and equipment |  |  | $ 1,196,000 | $ 170,000 |  |  |  |  |  |  |  |  |  | $ 1,080,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of employees who continued to provide services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  | 14 |  |  |  |  |
Outstanding restructuring liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual balance at the beginning of the period |  |  | 1,972,000 |  |  | 1,972,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 430,000 | 2,702,000 | 1,462,000 | 2,702,000 | 5,449,000 | 716,000 | 200,000 | 546,000 |  | 1,370,000 | 624,000 |  | 200,000 | 546,000 | 2,794,000 |  | 92,000 | 2,702,000 | 2,523,000 | 271,000 |  |  | 5,449,000 |  | 4,575,000 | 874,000
Stock-based compensation expense related to extension of the post-termination exercise period |  |  |  |  |  |  |  |  |  |  | 28,000 |  |  |  |  |  |  |  | 107,000 |  |  |  |  |  | 174,000 |
Expected cash payments |  |  |  |  |  |  |  |  | 1,087,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments |  |  | (2,911,000) |  |  | (2,438,000) |  | (473,000) |  |  |  | 993,000 |  |  |  |  | 2,271,000 |  |  |  |  | 4,165,000 |  |  |  |
Adjustments or non-cash credits, including stock-based compensation expense |  |  | (429,000) |  |  | (229,000) | (200,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual balance at the end of the period | $ 94,000 | $ 1,972,000 | $ 94,000 | $ 1,972,000 |  | $ 21,000 |  | $ 73,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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